Process for purifying the residue obtained in producing ammonia from cyanides



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1 l ter, Illl ll, llltln we e u t i u w u we ll lita ill llltti ell oi l tlhll .tto Throwing. Application filed July ti,

To all whom it may concern:

Be it known that we, CARL 'lnnonon 'lncons- SELL, citizen of Sweden, residing Koo niensgetsn 520, Gottenhorg, Sweden, and ltliinnrio llinnrio :HElNHOLU Lnrrnin, 2i citizen of Sweden, residing at l iopmonsgaten 20, tlottenhorg, Sweden, have invented certein new 21nd useful improvements in Processes for Purifying the llesidue tlhtsined in Pro clucing Ammonia from Cyenides, of which the following; is s specification.

This invention relates to a process for carrying out chemical reaction between gases and solid substances at high temperatures, 'und especially for the production of cysnides.

lit is well known that scientists and technists have {for it long time pest, and up to the present dsy, been investigating the possihility oil fixing nitrogen in the form of eye-- nide by allowing it to react upon a mixture of'coul and allrsli metals, or ulkelineeurth metals or their compounds, at high tempera; tures. in carrying out experiments on at larger sonic, however, ditliculties erose which rendered s continuous factorj working impossible, and it. has hitherto proved a failure to eliminate these diil'iculties.

The present-invention has for its object to remove the substantial obstacles to a continuous end regulsr fectory-worlrin q.

Attempts have been made to add substances which accelerate the reaction, but nothing; hos been done with regard to suhstzinces in the form of impurities that impede the re action.

lit is evident that it is of great importance for accomplishing a reel continuous i'f'eotoryworking according to these methods to bring the loose, ulkzili or silkolineeurth, hack into the process, if alnmonio is produced from the cyanide obtained. This can, however, not be done in methods hitherto known more then up to at certain time, its the mixture brought heck soon loses its power of rene tion.

This power of reaction is particularly re duced by the presence of silicic acid, elumino, end the like, in the mixture of reaction, which suhstences come in partly. with the chercoel, partly with the materials in the form of earth and the reection'proper, eepeciellgt when tor inssnd, end partlyduringi ilwdrete.

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thee suh 'tsnc i notes w' h the ircscnt ii i, e. with the slim l or the the uluinineiorins elnininut come evident, thnt even :1 smell of such impurit reduces 7 action in the highest do use that the alkali or site, present, is tinnsttornic pounds wit? much greater is especially shown. by .Q peruture must he considers .deif to ohtlin rly this necessary increase ten be increased in accordance of impuri ies. I

For instance, assume it .u ete of hsriuin and cool is u current of nitrogen is puss tion oi-cyenide heriuin, i production. of HIIHTIOHlZt, It r that an impurity silicic which forms silicate of he, L carbonate ot' bariumcorresponds to hetween th e and fold quantity of carbonate of liaexriuni. the power of reaction is suhseouentl siderahly reduced and the mess will e come eventually entirely inech, leiertion results lien for in ete oi sodium is used in the reactio which. case the lining of n't the mess contains a queen y of sili correspondingto halt the quantity or e hoiuite oi sodiuxn According to the present inf. .3. cute and ulnminutc are dc means of a suitable ecid stroi acid, alumina, or other iinpui l'lowever, must not contain any other than oxygen, hydrogen, cs; nitrogen, in order thst the may not hecoine imp {lire w suitable and the cheepest soid t is carhm'i dio'rrid, Thus, if UM gas continuing; enrhon diozrir mess dissolved, or stirred l V silicic acid will 'preeip in the form of a moderately diluted solution/ 0 introduce the carbon dioxid at high temp ranthen the silicic acid precipitates in a gela? ature's and at high pressures, in such a nerthat the precipitate becomes pulveru entand thus may be removed more easily, .as it is difiicultto filter and wash the same in a gelatinous condition. When alkaline earth compounds are used as ingredients in the mass of reaction, it is evidentvthat carbon dioxid cannot be used, whi1etheir insoluble carbonates cannot be separated from the pre- "cipitated impurities.

Thus the new processis only a process for "apurifying the mass that remains when all the nitrogen in the cyanide holding mass of reaction in a known manner by treating with water (optionally under pressure and heating) has been transferred into ammonia. In- I stead of adding carbon dioxid the mass may also be purified by making the solution caustic means of oxide of calcium. In this case a precipitate is obtained which is granular and easy to wash.

What we claim is The herein described rocess of purifying aghydrolized product 0? a cyanide-forming reaction characterized in that the compounds present in the mass of reaction and consisting of silicates audi ialuminates, which are formed .by the reaction by the base used in the mass, after water treatment of the cyanide-holdin mass for the production of ammonia, are d by carbon dioxide.

In testimony whereof, we have signed our names to this specification in the presence of two subscribing witnesses.

CARL THEODOR THORSSELL.

HARALD LUDVlG REINHOLD LUNDEN.

Witnesses:

JOHN TEROLF CL'ARENB,

Canon .M. Anonason.

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